The iTunes Festival 2011 is now well under way in London, boasting 31 nights of music from 62 artists including Coldplay, Foo Fighters, Linkin Park, Bruno Mars, My Chemical Romance, and many more. If you weren’t lucky enough to bag yourself some tickets, you can still enjoy every show live and on demand with the iTunes Festival London 2011 app for your iOS device — the first of this week’s must-have iOS applications!

We’ve also included the brand new Starbucks app, which boasts Mobile Pay, reward card management and eGifts; and the Photosynth app from Microsoft, which just got an awesome update!

The iTunes Festival app is your ticket to this year’s 31-night event with 62 artists — all of which you can enjoy live on your iPhone, iPod touch and iPad. Explore the lineup in detail, watch shows as they happen or later on demand, and stream every gig to your TV with support for AirPlay. Don’t miss Linkin Park — live tonight from 8 PM BST!

The official Starbucks app for your iPhone now allows you to manage your Starbucks Card balance, reload your card, track your Stars in the My Starbucks Rewards Program, and send eGifts to your friends. Navigate your nearest Starbucks store, explore a range of whole bean coffees, view the food menu and find nutritional information, and build your own perfect drink — all in the palm of your hand. You can even search for Starbucks jobs!

Microsofts Photosynth panoramic camera app for the iPhone just got an awesome new update, introducing some of the most requested features from its 3,500,000 users. The photo sharing experience has now been streamlined and allows you to share your creations via email; you can view the best panoramas other users are creating from across the planet in the new Best of Bing Maps feature; and you can even win an Xbox 360:

Best of Bing Maps – See the very best panoramas from around the world (and submit your own!)

Summer Xbox Contest – The best panorama entry each week wins an Xbox with Kinect

Email Sharing – Crop and send images of your panoramas via email

Streamlined Sharing – Publish to Facebook and Bing Maps at the same time

Camera Roll – Crop your panoramas inside the app and save them to the device

BeachWeather claims to be the best app for your summer holidays, allowing you to check the weather at your favorite beaches at several thousand coastal cities throughout Europe and the United States. Get a 3-day forecast for cities you select, with information such as air temperature, sea temperature, sunrise and sunset times, high & low tides, wind speed & direction and UV index.

Similar to BBC iPlayer, ITV Player allows those in the U.K. to catch up on their favorite ITV, ITV2, ITV3 and ITV4 shows on their iOS device. Watch as many shows as you wish completely free over Wi-Fi for up to 7 days after broadcast. Browse recommended programs and search shows by channel and alphabetically.